shell-1.log

$ date | nc -l 0.0.0.0 8080
GET / HTTP/1.1
Host: 127.0.0.1:8080
User-Agent: curl/7.51.0
Accept: */*

shell-2.log

$ curl -v http://127.0.0.1:8080/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* connect to 127.0.0.1 port 8080 failed: Connection timed out
* Failed to connect to 127.0.0.1 port 8080: Connection timed out
* Closing connection 0
curl: (7) Failed to connect to 127.0.0.1 port 8080: Connection timed out
$ curl -v http://127.0.0.1:8080/
*   Trying 127.0.0.1...
* TCP_NODELAY set
* Connected to 127.0.0.1 (127.0.0.1) port 8080 (#0)
> GET / HTTP/1.1
> Host: 127.0.0.1:8080
> User-Agent: curl/7.51.0
> Accept: */*
> 
Fri Apr 28 14:23:43 CEST 2017
* Curl_http_done: called premature == 0
* Connection #0 to host 127.0.0.1 left intact

tcpdump.log

14:23:43.958447 IP 127.0.0.1.38230 > 127.0.0.1.8080: Flags [S], seq 3637901325, win 65495, options [mss 65495,sackOK,TS val 2204071257 ecr 0,nop,wscale 3], length 0
14:23:44.999650 IP 127.0.0.1.38230 > 127.0.0.1.8080: Flags [S], seq 3637901325, win 65495, options [mss 65495,sackOK,TS val 2204072299 ecr 0,nop,wscale 3], length 0
14:23:47.047940 IP 127.0.0.1.38230 > 127.0.0.1.8080: Flags [S], seq 3637901325, win 65495, options [mss 65495,sackOK,TS val 2204074347 ecr 0,nop,wscale 3], length 0
14:23:51.080120 IP 127.0.0.1.38230 > 127.0.0.1.8080: Flags [S], seq 3637901325, win 65495, options [mss 65495,sackOK,TS val 2204078379 ecr 0,nop,wscale 3], length 0
14:24:09.987682 IP 127.0.0.1.38292 > 127.0.0.1.8080: Flags [S], seq 3236281677, win 65495, options [mss 65495,sackOK,TS val 627401386 ecr 0,nop,wscale 3], length 0
14:24:09.987698 IP 127.0.0.1.8080 > 127.0.0.1.38292: Flags [S.], seq 1011489289, ack 3236281678, win 65483, options [mss 65495,sackOK,TS val 1527625492 ecr 627401386,nop,wscale 3], length 0
14:24:09.987706 IP 127.0.0.1.38292 > 127.0.0.1.8080: Flags [.], ack 1, win 8187, options [nop,nop,TS val 627401386 ecr 1527625492], length 0
14:24:09.987760 IP 127.0.0.1.38292 > 127.0.0.1.8080: Flags [P.], seq 1:79, ack 1, win 8187, options [nop,nop,TS val 627401386 ecr 1527625492], length 78: HTTP: GET / HTTP/1.1
14:24:09.987765 IP 127.0.0.1.8080 > 127.0.0.1.38292: Flags [.], ack 79, win 8186, options [nop,nop,TS val 1527625492 ecr 627401386], length 0
14:24:09.987785 IP 127.0.0.1.8080 > 127.0.0.1.38292: Flags [P.], seq 1:31, ack 79, win 8186, options [nop,nop,TS val 1527625492 ecr 627401386], length 30: HTTP
14:24:09.987853 IP 127.0.0.1.38292 > 127.0.0.1.8080: Flags [F.], seq 79, ack 32, win 8187, options [nop,nop,TS val 627401386 ecr 1527625492], length 0
14:24:09.987858 IP 127.0.0.1.8080 > 127.0.0.1.38292: Flags [.], ack 80, win 8186, options [nop,nop,TS val 1527625492 ecr 627401386], length 0